I was put in touch with the company via a recruiter and talked to someone from the company shortly after. We talked about the company, its engineering team, the role I would fill, and of course my qualifications and technical background.

She was very polite and helpful overall. After that initial call, we assigned a date for a phone interview. The interview was done online via a phone call and a shared document/codepad.

The question wasn't hard at all. It was to parse a mathematical expression provided as a string and output its result.

I asked a couple of clarifying questions and proceeded to write a complete solution using the Shunting-yard algorithm by Dijkstra.

After the interview, I executed my code and only found a couple of minor errors unrelated to the overall algorithm.